CN111016732A - New energy automobile and battery management system thereof - Google Patents
New energy automobile and battery management system thereof Download PDFInfo
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- CN111016732A CN111016732A CN201811173240.6A CN201811173240A CN111016732A CN 111016732 A CN111016732 A CN 111016732A CN 201811173240 A CN201811173240 A CN 201811173240A CN 111016732 A CN111016732 A CN 111016732A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention relates to a new energy automobile and a battery management system thereof, which comprise a main controller, slave controllers and carrier modules, wherein each slave controller is used for detecting a battery module corresponding to control connection, each slave controller is connected to a low-voltage power supply cable in the battery management system through a corresponding matched carrier module, and the main controller is connected to the low-voltage power supply cable in the battery management system through a corresponding matched carrier module. The battery management system is used for realizing low-voltage carrier communication, so that the data transmission rate is improved, the real-time performance of data transmission is ensured, and the communication fault rate of the battery management system is reduced; in addition, the existing low-voltage power supply cable in the battery management system is used for carrying out carrier communication, the communication cable in the prior art is replaced, the connection of a low-voltage wire harness is reduced, the material cost is reduced, the supply period of parts is shortened, the field assembly efficiency is improved, and the economic cost is saved.
Description
Technical Field
The invention belongs to the technical field of communication of battery management systems, and particularly relates to a new energy automobile and a battery management system thereof.
Background
With the continuous improvement of new energy technologies, the requirements on the configuration electric quantity and the voltage platform of the battery management system are higher and higher, for example, in an electric passenger car, the configuration of the original system is about 200kWh and is improved to over 300kWh, and the voltage platform is improved from original DC500V to DC750V, so that the possibility of further improvement exists in the future. With the configuration of the battery management system being higher and higher, the number of the single batteries is multiplied, and in addition, the estimation of the battery state is more and more accurate, and the data acquisition amount of the battery state is more and more large, so that the communication data amount of the battery management system is more and more large, and the data transmission rate and the real-time performance are influenced.
Compared with the traditional automobile, new energy automobile (including electric automobile and hybrid vehicle) has increased more high-pressure cable and low pressure cable, along with electric automobile's intellectuality and environmental suitability promote, battery system need dispose high-pressure cable and low pressure cable, the high-pressure cable is including the power cable of the power return circuit of connecting battery module, the heating cable of the heating circuit of connecting battery module, the low pressure cable includes communication cable, fire extinguisher cable, and the quantity of cable is constantly increasing, has increased economic cost. On the other hand, especially for passenger cars, the number of harnesses (especially communication cables) increases the number of communication failure events of the battery management system, and the reliability and safety of the battery management system are affected to some extent for the end customers.
At present, CAN communication is mainly adopted for communication of a battery management system of a new energy automobile, and has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference capability, low cost, good compatibility, strong error detection capability and the like. Meanwhile, as battery monitoring and management technologies become mature, various sensors and auxiliary modules are configured as necessary, so that the number of low-voltage wire harnesses is increased, the problem of exposed wire harness communication faults is increased, and the reliability and safety of a battery management system are affected.
Disclosure of Invention
The invention aims to provide a new energy automobile and a battery management system thereof, which are used for solving the problems that in the battery management system in the prior art, the communication fault events are increased due to too large communication data volume and too many arranged communication cables.
In order to solve the technical problems, the invention provides a battery management system, which comprises a master controller and slave controllers, wherein each slave controller is used for detecting a battery module corresponding to control connection, the master controller and the slave controllers are respectively provided with corresponding carrier modules, each slave controller is connected with a signal interface corresponding to the matched carrier module, a power line coupling interface corresponding to the matched carrier module is connected to a low-voltage power supply cable in the battery management system, each slave controller is used for transmitting information corresponding to the battery module to the low-voltage power supply cable through the carrier module, and the low-voltage power supply cable is used for transmitting voltage provided by a storage battery after voltage reduction;
the main controller is connected with the signal interface of the corresponding matched carrier module, and the power line coupling interface of the corresponding matched carrier module is connected to a low-voltage power supply cable in the battery management system and used for receiving detection and control information uploaded by each slave controller in the low-voltage power supply cable through the carrier module, wherein the detection and control information is corresponding to the battery module.
In order to solve the technical problem, the invention further provides a new energy automobile which comprises the battery management system.
The battery management system is used for realizing low-voltage carrier communication, namely, information to be uploaded by each slave controller is transmitted to the master controller through the carrier module through the low-voltage power supply cable (used for transmitting the voltage provided by the storage battery), so that the data transmission rate is improved, the real-time performance of data transmission is ensured, the communication fault rate of the battery management system is reduced, and the reliability of the whole vehicle is improved. In addition, the existing low-voltage power supply cable in the battery management system is used for carrying out carrier communication, a communication cable (CAN bus) in the prior art is replaced, the connection of a low-voltage wire harness is reduced, the material cost is reduced, the supply period of parts is shortened, the field assembly efficiency is improved, and the economic cost is saved.
In order to ensure that the master controller quickly issues the control information of each slave controller, the master controller is used for transmitting the detection and control information of the corresponding battery module to the low-voltage power supply cable, and each slave controller is used for receiving the control information of the corresponding battery module issued by the master controller in the low-voltage power supply cable through the carrier module.
In order to further reduce low-voltage wiring harnesses and save economic cost, each slave controller and the corresponding matched carrier module are connected with a low-voltage power supply cable through a direct-current voltage converter, and the low-voltage power supply cable is used for supplying power to each slave controller and the corresponding matched carrier module. Meanwhile, the main controller is connected with a low-voltage power supply cable through a direct-current voltage converter, and the low-voltage power supply cable is used for supplying power to the main controller.
In order to solve the problem of inconsistent state of charge among the battery modules, the slave controllers are connected with the corresponding matched battery modules through the electric quantity balancing module.
Drawings
FIG. 1 is a schematic diagram of the connections of the battery management system of the present invention;
FIG. 2 is a schematic diagram of the connection of a battery module of the present invention to a slave controller, carrier module;
fig. 3 is a communication flow diagram of the battery management system of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The battery management system shown in fig. 1 comprises a master controller, a plurality of slave controllers and carrier modules, the number of the carrier modules is matched with that of the master controller, each slave controller detects the battery modules corresponding to the control connection (the battery modules are connected through a power wire harness to form a power loop, and the battery modules are provided with heating parts and heating cables to form a heating loop according to needs), each slave controller is connected to a low-voltage power supply cable (used for transmitting voltage provided by the storage battery after voltage reduction) provided by the storage battery through the corresponding matched carrier module, namely, each slave controller is connected with a signal interface corresponding to the matched carrier module, and the power line coupling interface corresponding to the matched carrier module is connected with the low-voltage power supply cable. Each slave controller is used for transmitting the information of the corresponding battery module to the low-voltage power supply cable through the carrier module, and receiving the control information of the corresponding battery module issued by the master controller in the low-voltage power supply cable through the carrier module.
The main controller is connected to a 24V low-voltage power supply cable in the battery management system through the corresponding matched carrier modules, namely the main controller is connected with signal interfaces of the corresponding matched carrier modules, power line coupling interfaces of the corresponding matched carrier modules are connected with the low-voltage power supply cable, the power line coupling interfaces are used for transmitting control information of the corresponding battery modules to the low-voltage power supply cable, and the carrier modules are used for receiving the control information of the corresponding battery modules uploaded from controllers in the low-voltage power supply cable.
Each battery module in fig. 1 is connected with each carrier module through a 24V low-voltage power supply cable, and is connected with a motor controller and a motor through a high-voltage junction box after being connected through a power cable, the high-voltage junction box is also connected with a charger, and the vehicle controller is still connected with a main controller and a motor controller through a low-voltage wiring harness (such as a CAN bus).
As shown in fig. 2, a slave controller and a corresponding matched carrier module are integrated in the battery module, the slave controller is responsible for collecting information such as temperature and voltage of the battery module, and the master controller is responsible for processing information uploaded by the slave controller and is responsible for information interaction between the vehicle controller and the slave controller. Each carrier module comprises a signal interface, a microprocessor, a signal modulation unit and a power line coupling interface which are sequentially connected, the signal interface is used for being connected with a slave controller, and the power line coupling interface is used for being connected to a low-voltage power supply cable.
The communication process for transferring information from the slave controller to the master controller is as follows:
after data of the battery modules are collected by each slave controller, information processing is carried out, messages are sent to the microprocessor through the signal interface of the carrier module according to a communication protocol, signal modulation is carried out through the signal modulation module, the modulated messages are sent to the carrier module matched with the master controller through the power line coupling interface and the 24V low-voltage power supply cable, the messages are sent to the master controller through the power line coupling interface, the communication signal modulation, the microprocessor processing and the signal interface in the carrier module matched with the master controller, and information uploading of each battery module is completed.
The communication process for the master controller to transmit information to the slave controllers is as follows:
the main controller analyzes and processes data uploaded by each battery module, the instructions are compiled into messages, the messages pass through the carrier modules matched with the main controller and then are sent to the carrier modules matched with the slave controllers through 24V low-voltage power supply cables, and the messages are subjected to signal modulation through the carrier modules matched with the slave controllers and then are sent to the slave controllers.
In this embodiment, from the controller, correspond the carrier wave module and the main control unit of matching and all adopt the mode of concentrating the power supply, the low pressure power supply cable passes through direct voltage converter power supply connection main control unit, each from controller and correspond the carrier wave module of matching, realizes the power supply to main control unit, each battery module slave controller and carrier wave module to guarantee battery management system's normal operating, reduced the low pressure pencil to a certain extent, reach the purpose of practicing thrift the cost.
The slave controllers are connected with the corresponding matched battery modules through the electric quantity balancing modules, and the problem that the states of charge among the battery modules are inconsistent is solved. As shown in fig. 3, the slave controller of each battery module has battery status monitoring and battery equalization control functions, can monitor the battery health status and the power consumption of the slave controller in real time, and the state of the battery module is uploaded to the main controller in a carrier communication mode, and after the main controller analyzes and processes the data, the main controller sends the electric quantity value to be adjusted to each battery module, the slave controller periodically starts the electric quantity balancing module of the corresponding battery module, the state of charge of the battery modules is regularly adjusted, the consistency of the state of charge of the batteries of the whole battery management system is ensured, and the problem of inconsistent state of charge among the battery modules in the battery management system caused by different battery numbers of single battery modules or different power consumptions of single slave controllers is solved.
The electric quantity equalization process of the electric quantity equalization module comprises the following steps: when the electric quantity value to be adjusted is received from the controller and is smaller than the electric quantity in the corresponding battery module, the electric quantity consumption element (such as a resistor) is adopted to consume the redundant electric quantity, and when the electric quantity value to be adjusted is larger than the electric quantity in the corresponding battery module, the corresponding battery module is charged to supplement the missing electric quantity.
The battery management system is used for realizing low-voltage carrier communication, namely, the information to be uploaded by each slave controller is transmitted to the master controller through the low-voltage power supply cable by the carrier module, and the information to be issued by the master controller is transmitted to each slave controller through the low-voltage power supply cable by the carrier module, so that the data transmission rate is improved, the real-time performance of data transmission is ensured, the communication failure rate of the battery management system is reduced, and the reliability of the whole vehicle is improved. In addition, the existing low-voltage power supply cable in the battery management system is used for carrying out carrier communication, a communication cable (CAN bus) in the prior art is replaced, the connection of a low-voltage wire harness is reduced, the material cost is reduced, the supply period of parts is shortened, the field assembly efficiency is improved, and the economic cost is saved.
The invention also provides a new energy automobile which comprises the battery management system in the embodiment, and the description of the battery management system is clear and complete enough, so that the detailed description is omitted.
Claims (10)
1. A battery management system comprises a master controller and slave controllers, wherein each slave controller is used for detecting a battery module corresponding to control connection, and is characterized in that the master controller and the slave controllers are respectively provided with corresponding carrier modules, each slave controller is connected with a signal interface corresponding to the matched carrier module, a power line coupling interface corresponding to the matched carrier module is connected to a low-voltage power supply cable in the battery management system, each slave controller is used for transmitting information corresponding to the battery module to the low-voltage power supply cable through the carrier module, and the low-voltage power supply cable is used for transmitting voltage provided by a storage battery after voltage reduction;
the main controller is connected with the signal interface of the corresponding matched carrier module, and the power line coupling interface of the corresponding matched carrier module is connected to a low-voltage power supply cable in the battery management system and used for receiving detection and control information uploaded by each slave controller in the low-voltage power supply cable through the carrier module, wherein the detection and control information is corresponding to the battery module.
2. The battery management system of claim 1, wherein the master controller is configured to transmit control information corresponding to the battery module to the low-voltage power supply cable, and each of the slave controllers is configured to receive, via the carrier module, detection and control information corresponding to the battery module issued by the master controller in the low-voltage power supply cable.
3. The battery management system according to claim 1 or 2, wherein each slave controller and the corresponding matched carrier module are connected to the low-voltage power supply cable through a direct-current voltage converter.
4. A battery management system according to claim 1 or 2, wherein the main controller is connected to the low voltage supply cable by a dc voltage converter.
5. The battery management system of claim 1, wherein each slave controller is connected to a corresponding matched battery module through a power equalization module.
6. A new energy automobile comprises a battery management system, wherein the battery management system comprises a master controller and slave controllers, and each slave controller is used for detecting a battery module corresponding to control connection;
the main controller is connected to a low-voltage power supply cable in the battery management system through the corresponding matched carrier modules and is used for receiving detection and control information uploaded by each slave controller in the low-voltage power supply cable through the carrier modules, wherein the detection and control information is corresponding to the battery modules.
7. The new energy automobile of claim 6, wherein the master controller is configured to transmit control information corresponding to the battery module to the low-voltage power supply cable, and each slave controller is configured to receive detection and control information corresponding to the battery module from the master controller in the low-voltage power supply cable through the carrier module.
8. The new energy automobile according to claim 6 or 7, characterized in that each slave controller and the corresponding matched carrier module are connected with the low-voltage power supply cable through a direct-current voltage converter.
9. The new energy automobile as claimed in claim 6 or 7, wherein the main controller is connected to the low voltage power supply cable through a direct current voltage converter.
10. The new energy automobile of claim 6, wherein each slave controller is connected with the corresponding matched battery module through the electric quantity balancing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811173240.6A CN111016732A (en) | 2018-10-09 | 2018-10-09 | New energy automobile and battery management system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811173240.6A CN111016732A (en) | 2018-10-09 | 2018-10-09 | New energy automobile and battery management system thereof |
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| CN111016732A true CN111016732A (en) | 2020-04-17 |
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| CN201811173240.6A Pending CN111016732A (en) | 2018-10-09 | 2018-10-09 | New energy automobile and battery management system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114407682A (en) * | 2022-02-15 | 2022-04-29 | 莱州亚通重型装备有限公司 | Electric control system of mining explosion-proof electric concrete mixing transport vehicle |
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Cited By (1)
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| CN114407682A (en) * | 2022-02-15 | 2022-04-29 | 莱州亚通重型装备有限公司 | Electric control system of mining explosion-proof electric concrete mixing transport vehicle |
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Application publication date: 20200417 |
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